Benro 100mm Half Ball Adapter (BL100) Allows you to use 3/8"-16 flat base tripod heads with 100mm bowl tripods. Enables the user to create level horizons much more easily. Included is a tie down handle to hold the Half Ball Adapter into place at a relatively low clearance. Ideal for location shooting or for studio use. Limited 3-Year Warranty (Extended to 5-Years with Online Registration).